JP2006303391A - Coil for digital amplifier - Google Patents

Coil for digital amplifier Download PDF

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Publication number
JP2006303391A
JP2006303391A JP2005126977A JP2005126977A JP2006303391A JP 2006303391 A JP2006303391 A JP 2006303391A JP 2005126977 A JP2005126977 A JP 2005126977A JP 2005126977 A JP2005126977 A JP 2005126977A JP 2006303391 A JP2006303391 A JP 2006303391A
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JP
Japan
Prior art keywords
core
coil
shaped
air
plate
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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JP2005126977A
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Japanese (ja)
Inventor
Fumio Kai
Yukio Takada
文雄 甲斐
幸男 高田
Original Assignee
Sagami Ereku Kk
サガミエレク株式会社
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Application filed by Sagami Ereku Kk, サガミエレク株式会社 filed Critical Sagami Ereku Kk
Priority to JP2005126977A priority Critical patent/JP2006303391A/en
Publication of JP2006303391A publication Critical patent/JP2006303391A/en
Application status is Pending legal-status Critical

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Abstract

A coil for a digital amplifier having high space efficiency and less leakage magnetic flux is provided.
Two plate-like cores having an E-shaped cross section are combined to form a vertically long box-shaped core. An air-core coil is placed therein, and a resin base is aligned on the bottom to confine magnetic lines of force. An inner magnet type coil is formed. On the mating surface of the plate-shaped core 1, a left and right reversed P-shaped winding groove a is formed, and the air-core coil 3 is inserted into a circular core 5 surrounded by a circular groove b corresponding to the P-shaped head portion. In this configuration, the horizontally placed inner magnet type coils are arranged vertically. The air-core coil 3 is a solenoid type coil of a bobbin in which a coated copper wire such as urethane enamel is wound in a tubular shape or a winding without a core itself. The lead wire 6 is used. The box-shaped core 2 is assembled by inserting the air-core coil 3 separately wound around the circular core 5 of one plate-shaped core 1 and then aligning the other plate-shaped core 1 in the left-right reverse direction.
[Selection] Figure 1

Description

  The present invention relates to a digital amplifier coil mainly used for an LPF (low-pass filter) in a digital amplifier.

As shown in FIG. 6, the digital amplifier coil is necessary for the digital amplifier in order to remove the high-frequency switching signal unnecessary for listening and to drive the speaker S.
In this digital amplifier, as shown in FIG. 6 (a), one inductor L is required to ring one speaker S in the SEPP (Single Ended Push Pull) circuit method, and FIG. ) BTL (Balanced
In some cases, two inductors L are required to sound one speaker S in the Transformer Less) circuit system, and generally six or twelve inductors L are used for 5.1 channel. As the number of channels increases in this way, the mounting area increases with the number of work steps for mounting the inductor L on the circuit board.
Furthermore, when the inductor L is arranged, if it is not careful about the distance and the direction, it will be magnetically coupled and cause trouble, so a large mounting occupation area is required.
Therefore, in order to reduce the size of the digital amplifier, it is necessary to reduce the inductor L that requires a large amount and to reduce the mounting area by devising the arrangement and shielding method of the inductor L.

In addition, the coil for digital amplifier handles from low power to high power of several W to several hundred W, and it is necessary to remove switching signals unnecessary for listening over a wide band from several hundred kHz to several MHz. If the superposition characteristics of the coil for use deteriorate, distortion and unwanted radiation noise will be caused.
Therefore, in order to make digital amplifiers highly efficient, small, multi-channel, and high-quality sound, it is important to prevent deterioration of the superimposition characteristics of digital amplifier coils, suppress distortion and unnecessary radiation noise, and be small. .

  The problems to be solved are as described above, and the present invention prevents the deterioration of the superimposition characteristics of the digital amplifier coil, suppresses distortion / unnecessary radiation noise, improves the space efficiency, and reduces the leakage magnetic flux. The object is to provide an amplifier coil.

  Therefore, the present invention deforms the EP core to form a thin vertical hollow magnetic body block by aligning two plate-like cores having a P-shaped winding groove in the vertical direction in the opposite direction. Insert an air core coil with two lead wires pulled out downward in an inverted U shape into the body block, and insert the winding part of this air core coil into a circular groove corresponding to the P-shaped head. The most important feature is that the lead-out line is drawn out from the left and right linear grooves corresponding to the P-shaped bar portion, and the horizontally placed inner magnet type coils are arranged vertically.

In the present invention, a thin vertical hollow magnetic block is formed by combining two plate-like cores, so that the installation area can be reduced and the mounting occupation area of the inductor can be reduced.
Further, since the lead wire is drawn out from the left and right linear grooves corresponding to the P-shaped bar portion, the magnetic flux leaking from the bottom lead portion can be minimized.
Further, since the horizontally placed inner magnet type coil is vertically arranged in the hollow magnetic body block and the magnetic body block is orthogonal to the magnetic field lines, the magnetic field lines generated by the coils can be shielded strongly.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a digital amplifier coil embodying the present invention.
The coil for a digital amplifier is formed by combining two plate-like cores 1 each having an E-shaped cross section to form a vertically long box-shaped core 2, in which an air-core coil 3 is placed, and a resin base 4 is aligned with the bottom surface to generate magnetic field lines. An inner magnet type coil for confining the magnetic field is formed.
On the mating surface of the plate-shaped core 1, a left and right reversed P-shaped winding groove a is formed, and the air-core coil 3 is inserted into a circular core 5 surrounded by a circular groove b corresponding to the P-shaped head portion. In this configuration, the horizontally placed inner magnet type coils are arranged vertically.

The box-type core 2 may be formed by combining, for example, one of the two plate-like cores 1 with a depth approximately doubled and the other being plate-shaped.
In this case, the box-shaped core 2 has a shape in which the plate-shaped core 1 having an E-shaped cross section and the plate-shaped core 1 having an I-shaped cross section are combined.

The air-core coil 3 is a solenoid type coil of a bobbin in which a coated copper wire such as urethane enamel is wound in a tubular shape or a winding without a core itself. The lead wire 6 is used.
That is, the left and right lead wires 6 in contact with both ends of the circular winding are drawn downward in an inverted U shape.
The leading end of the lead wire 6 is peeled off from the insulating film to serve as an external connection terminal.

The air core coil 3 may have a shape in which a rectangular wire is edgewise wound to minimize the thickness of the winding.
As a result, it is possible to increase the line area ratio, further reduce the size and thickness of the coil, and improve the heat dissipation.
Further, by mounting the air-core coil 3 edgewise, the mounting area can be further reduced in combination with the vertically long box core 2.

The box-shaped core 2 is assembled by inserting the air-core coil 3 separately wound around the circular core 5 of one plate-shaped core 1 and then aligning the other plate-shaped core 1 in the left-right reverse direction.
At this time, the lead wire 6 of the air-core coil 3 is inserted downward, and the lead wire 6 is drawn out of the box core 2 through the left and right linear grooves c corresponding to the P-shaped bar portion.
Further, the lead wire 6 is pulled out below the resin base 4 through lead holes d formed at both ends in the length direction of the resin base 4.
If the air-core coil 3 is fixed using an adhesive or the like at the time of insertion, the subsequent assembly becomes easy.
Further, the mating surfaces of the two plate cores 1 and the mating surfaces of the box core 2 and the resin base 4 are bonded using an adhesive or the like.

FIG. 2 shows a front view of the inner wall of the plate core.
FIG. 3 shows a bottom view in which two plate-like cores are combined.
The plate-like core 1 is made of a polycrystalline sintered body, and is manufactured by filling a fine powder of ferrite material into a mold and integrally performing pressure molding, and then firing the pressure molded body at a high temperature. is there.
When correcting warpage after firing, the mating surfaces of the plate cores 1 are polished with a diamond grindstone to prevent magnetic loss due to an air gap.

The plate-like core 1 is formed integrally with a step in a portion (A portion) sandwiched between the left and right linear grooves c when the two pieces are combined, and the portion A is slightly lowered to make the plate-like core 1 A gap e is formed on the mating surfaces, and the magnetic resistance is increased to make the magnetic saturation difficult.
Ferrite materials are low in cost, but have the drawback of easily causing magnetic saturation. In principle, magnetic saturation can be made difficult to occur by increasing the core.
When a current is passed through the coil, there is a property that the inductance decreases due to magnetic saturation of the core material, and this degree is referred to as a DC superimposition characteristic. Although it has an inner magnetic structure as long as it is surrounded by the core 1 and the single resin base 4, it is possible to prevent the DC superimposition characteristics from deteriorating without enlarging the core by providing a gap e in the portion A.
4 and 5 show DC superposition characteristics with and without a gap in the portion A. FIG.
From the figure, it can be seen that if there is a gap in the portion A, the inductance reduction rate is improved as compared with the case where there is no gap.
Further, since the gap for the digital amplifier coil of the present invention is omitted by integral molding, the manufacturing cost can be reduced accordingly.

  Although the above embodiment has described the pin-type coil, it goes without saying that the same applies to the surface-mounted coil.

  A horizontal magnetic coil is arranged vertically in a hollow magnetic block to reduce the leakage magnetic flux and the board mounting area, so that it can be applied to miniaturization of a multi-channel digital amplifier or the like.

It is a disassembled perspective view of the coil for digital amplifiers which implemented this invention. It is a front view of the inner wall of a plate-shaped core. It is the bottom view which match | combined two plate-shaped cores. It is a direct current superimposition characteristic figure when there is a gap in the portion of A. It is a direct current superimposition characteristic view when there is no gap in the portion A. It is a circuit diagram of LPF for digital amplifiers.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate-shaped core 2 Box-type core 3 Air core coil 4 Resin base 5 Circular core 6 Lead wire a Winding groove b Circular groove c Straight groove d Lead hole e Gap L Inductor S Speaker

Claims (5)

  1. The EP core is deformed to form a thin vertical hollow magnetic body block by aligning two plate-like cores having a P-shaped winding groove in the vertical direction in opposite directions,
    In this magnetic block, put an air-core coil with two lead wires pulled out downward in an inverted U shape,
    The winding part of this air-core coil is inserted into a circular groove corresponding to the P-shaped head part,
    A coil for a digital amplifier, characterized in that a lead wire is drawn out from left and right linear grooves corresponding to a P-shaped bar portion, and a horizontal inner magnet type coil is arranged vertically.
  2.   2. The coil for digital amplifier according to claim 1, wherein a gap between the two cores is provided by slightly lowering a portion sandwiched between the left and right linear grooves.
  3. Match the plate-like core to the bottom of the magnetic block,
    2. The coil for digital amplifier according to claim 1, wherein two lead wires are finally led out of the core through through holes formed at both ends of the core.
  4.   2. The digital amplifier coil according to claim 1, wherein the air-core coil is formed by edgewise winding a rectangular wire.
  5. 2. The coil for digital amplifier according to claim 1, wherein the magnetic block is formed by combining an I-shaped core with an E-shaped core having a P-shaped winding groove in the vertical direction.
JP2005126977A 2005-04-25 2005-04-25 Coil for digital amplifier Pending JP2006303391A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005126977A JP2006303391A (en) 2005-04-25 2005-04-25 Coil for digital amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005126977A JP2006303391A (en) 2005-04-25 2005-04-25 Coil for digital amplifier

Publications (1)

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JP2006303391A true JP2006303391A (en) 2006-11-02

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012028527A (en) * 2010-07-22 2012-02-09 Koa Corp Magnetic device and manufacturing method therefor
JP2013232585A (en) * 2012-05-01 2013-11-14 Alps Green Devices Co Ltd Coil component
CN103531339A (en) * 2013-10-30 2014-01-22 浙江昱能光伏科技集成有限公司 Transformer
JP2016058690A (en) * 2014-09-12 2016-04-21 Necトーキン株式会社 Reactor
WO2018038008A1 (en) * 2016-08-22 2018-03-01 住友電装株式会社 Coil assembly, circuit component, and junction box

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6016519U (en) * 1983-02-21 1985-02-04
JPS63124728U (en) * 1987-02-05 1988-08-15
JPH0513016U (en) * 1991-07-30 1993-02-19 東邦亜鉛株式会社 Inductor
JPH09232155A (en) * 1996-02-27 1997-09-05 Hitachi Ferrite Denshi Kk Inductance element
JPH09306757A (en) * 1996-05-14 1997-11-28 Sumitomo Special Metals Co Ltd Low profile coil and magnetic product
JP2001044044A (en) * 1999-07-26 2001-02-16 Concorde Denshi Kogyo:Kk Surface-mounting inductor
JP2001060523A (en) * 1999-08-20 2001-03-06 Concorde Denshi Kogyo:Kk Surface-mounting inductor
JP2002093625A (en) * 2000-09-18 2002-03-29 Totoku Electric Co Ltd Method of rorming depletion layer
JP2002359118A (en) * 2001-05-31 2002-12-13 Toko Inc Inductor
JP2003133139A (en) * 2001-10-26 2003-05-09 Toko Inc Inductor for digital amplifier
JP2003151832A (en) * 2001-08-31 2003-05-23 Toko Inc Inductor block
JP2003224013A (en) * 2002-01-29 2003-08-08 Toko Inc Filter block

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6016519U (en) * 1983-02-21 1985-02-04
JPS63124728U (en) * 1987-02-05 1988-08-15
JPH0513016U (en) * 1991-07-30 1993-02-19 東邦亜鉛株式会社 Inductor
JPH09232155A (en) * 1996-02-27 1997-09-05 Hitachi Ferrite Denshi Kk Inductance element
JPH09306757A (en) * 1996-05-14 1997-11-28 Sumitomo Special Metals Co Ltd Low profile coil and magnetic product
JP2001044044A (en) * 1999-07-26 2001-02-16 Concorde Denshi Kogyo:Kk Surface-mounting inductor
JP2001060523A (en) * 1999-08-20 2001-03-06 Concorde Denshi Kogyo:Kk Surface-mounting inductor
JP2002093625A (en) * 2000-09-18 2002-03-29 Totoku Electric Co Ltd Method of rorming depletion layer
JP2002359118A (en) * 2001-05-31 2002-12-13 Toko Inc Inductor
JP2003151832A (en) * 2001-08-31 2003-05-23 Toko Inc Inductor block
JP2003133139A (en) * 2001-10-26 2003-05-09 Toko Inc Inductor for digital amplifier
JP2003224013A (en) * 2002-01-29 2003-08-08 Toko Inc Filter block

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012028527A (en) * 2010-07-22 2012-02-09 Koa Corp Magnetic device and manufacturing method therefor
JP2013232585A (en) * 2012-05-01 2013-11-14 Alps Green Devices Co Ltd Coil component
CN103531339A (en) * 2013-10-30 2014-01-22 浙江昱能光伏科技集成有限公司 Transformer
CN103531339B (en) * 2013-10-30 2015-11-25 浙江昱能科技有限公司 Transformer
JP2016058690A (en) * 2014-09-12 2016-04-21 Necトーキン株式会社 Reactor
WO2018038008A1 (en) * 2016-08-22 2018-03-01 住友電装株式会社 Coil assembly, circuit component, and junction box
JP2018032665A (en) * 2016-08-22 2018-03-01 住友電装株式会社 Coil assembly, circuit structure, and electric connection box

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